perhapse its because you are posting this? (slight joke)
in all realness, you may just want to do something exausting durring the day (if you are not having psycological sleep issues.)
if you have phycological sleep issues you may want to come to terms which what you are battling.
i found a bunch of articles on how to fall asleep quickly, nothing worked
I just gave up at one point, read until 6:30, then came out and had an iced mocha